Cisco Expressway Flaw Lets Attackers Execute Commands as Root
Original title: Critical Cisco Expressway Flaw Lets Attackers Execute Commands as Root
Cisco patches CVE-2026-76466 for remote root command execution in clustered Expressway deployments.
Cisco released security updates addressing a critical flaw in its Expressway Series. The vulnerability allows unauthenticated remote attackers to execute arbitrary OS commands as root when clustered deployments are configured with persistent cookies and inadequate client certificate validation. It affects Expressway Core and Edge versions. Cisco has not reported any known exploitation.
Unconfirmed: No public exploitation reported by Cisco
- CVSS 9.8
- Affects X15.5.3 and earlier
- Fixed in X15.5.20
- Requires network access and cookies
Impact: arbitrary command execution as root
- 1.Upgrade to X15.5.20
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-76466 | Unauthenticated root RCE in Cisco Expressway database service | 9.8 | — |
From the original article
2 min read at gbhackers.com
Cisco has released security updates to address a critical vulnerability in its Expressway Series. This flaw, tracked as CVE-2026-76466, could allow unauthenticated remote attackers to execute arbitrary operating system commands with root privileges. It has a CVSS v3.
By Divya · gbhackers.com
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